Saw the same thing here two or three years ago. We noticed a couple of really giant dragon flies hovering around our back yard. We went out to watch them and they weren't bothered by us being there. After a few minutes of watching a half dozen of them fly around, we looked up and realized there were a hundred more flying over our heads.
They were all doing exactly what you described, would dart off, hover, change direction, and dart off again. Before that day I had seen them around occasionally but never more than two or three at a time.
They stayed for maybe half an hour and all flew away. We've never seen them again.
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Swarm of ~100 dragon flies zippety zooming around.
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